Grcov report - lib.rs

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// Copyright (C) Moondance Labs Ltd.

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// This file is part of Tanssi.

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// Tanssi is free software: you can redistribute it and/or modify

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// it under the terms of the GNU General Public License as published by

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// the Free Software Foundation, either version 3 of the License, or

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// (at your option) any later version.

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// Tanssi is distributed in the hope that it will be useful,

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// but WITHOUT ANY WARRANTY; without even the implied warranty of

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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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// GNU General Public License for more details.

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// You should have received a copy of the GNU General Public License

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// along with Tanssi.  If not, see <http://www.gnu.org/licenses/>

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//! # Services Payment pallet

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//!

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//! This pallet allows for block creation services to be paid for by a

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//! containerChain.

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#![cfg_attr(not(feature = "std"), no_std)]

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extern crate alloc;

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#[cfg(feature = "runtime-benchmarks")]

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use tp_traits::BlockNumber;

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use {

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    cumulus_primitives_core::ParaId,

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    frame_support::{

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        pallet_prelude::*,

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        sp_runtime::{traits::Zero, Saturating},

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        traits::{

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            tokens::ExistenceRequirement, Currency, EnsureOriginWithArg, OnUnbalanced,

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            WithdrawReasons,

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},

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},

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    frame_system::pallet_prelude::*,

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    scale_info::prelude::vec::Vec,

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    serde::{Deserialize, Serialize},

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    sp_io::hashing::blake2_256,

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    sp_runtime::{traits::TrailingZeroInput, DispatchError},

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    tp_traits::{AuthorNotingHook, CollatorAssignmentHook, CollatorAssignmentTip},

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};

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#[cfg(any(test, feature = "runtime-benchmarks"))]

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mod benchmarks;

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#[cfg(test)]

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mod mock;

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#[cfg(test)]

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mod tests;

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pub mod weights;

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pub use weights::WeightInfo;

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pub use pallet::*;

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use tp_traits::AuthorNotingInfo;

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24960

#[frame_support::pallet]

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pub mod pallet {

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    use super::*;

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    #[pallet::config]

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    pub trait Config: frame_system::Config {

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        /// The overarching event type.

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        type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;

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        /// Handlers for fees

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        type OnChargeForBlock: OnUnbalanced<NegativeImbalanceOf<Self>>;

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        type OnChargeForCollatorAssignment: OnUnbalanced<NegativeImbalanceOf<Self>>;

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        type OnChargeForCollatorAssignmentTip: OnUnbalanced<NegativeImbalanceOf<Self>>;

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        /// Currency type for fee payment

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        type Currency: Currency<Self::AccountId>;

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        /// Provider of a block cost which can adjust from block to block

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        type ProvideBlockProductionCost: ProvideBlockProductionCost<Self>;

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        /// Provider of a block cost which can adjust from block to block

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        type ProvideCollatorAssignmentCost: ProvideCollatorAssignmentCost<Self>;

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        /// The maximum number of block production credits that can be accumulated

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        #[pallet::constant]

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        type FreeBlockProductionCredits: Get<BlockNumberFor<Self>>;

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        /// The maximum number of collator assigment production credits that can be accumulated

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        #[pallet::constant]

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        type FreeCollatorAssignmentCredits: Get<u32>;

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        /// Owner of the container chain, can call some only-owner methods

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        type ManagerOrigin: EnsureOriginWithArg<Self::RuntimeOrigin, ParaId>;

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        type WeightInfo: WeightInfo;

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    #[pallet::error]

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    pub enum Error<T> {

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        InsufficientFundsToPurchaseCredits,

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        InsufficientCredits,

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        CreditPriceTooExpensive,

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69439

    #[pallet::pallet]

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    pub struct Pallet<T>(PhantomData<T>);

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624

    #[pallet::event]

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32604

    #[pallet::generate_deposit(pub(super) fn deposit_event)]

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    pub enum Event<T: Config> {

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        CreditsPurchased {

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            para_id: ParaId,

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            payer: T::AccountId,

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            credit: BalanceOf<T>,

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},

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        BlockProductionCreditBurned {

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            para_id: ParaId,

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            credits_remaining: BlockNumberFor<T>,

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},

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        CollatorAssignmentCreditBurned {

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            para_id: ParaId,

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            credits_remaining: u32,

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},

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        CollatorAssignmentTipCollected {

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            para_id: ParaId,

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            payer: T::AccountId,

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            tip: BalanceOf<T>,

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},

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        BlockProductionCreditsSet {

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            para_id: ParaId,

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            credits: BlockNumberFor<T>,

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},

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        RefundAddressUpdated {

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            para_id: ParaId,

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            refund_address: Option<T::AccountId>,

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},

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        MaxCorePriceUpdated {

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            para_id: ParaId,

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            max_core_price: u128,

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},

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        CollatorAssignmentCreditsSet {

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            para_id: ParaId,

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            credits: u32,

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},

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56250

    #[pallet::storage]

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    pub type BlockProductionCredits<T: Config> =

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        StorageMap<_, Blake2_128Concat, ParaId, BlockNumberFor<T>, OptionQuery>;

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    #[pallet::storage]

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    pub type CollatorAssignmentCredits<T: Config> =

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        StorageMap<_, Blake2_128Concat, ParaId, u32, OptionQuery>;

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    /// List of para ids that have already been given free credits

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1078

    #[pallet::storage]

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    pub type GivenFreeCredits<T: Config> = StorageMap<_, Blake2_128Concat, ParaId, (), OptionQuery>;

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    /// Refund address

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    #[pallet::storage]

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    pub type RefundAddress<T: Config> =

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        StorageMap<_, Blake2_128Concat, ParaId, T::AccountId, OptionQuery>;

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    /// Max core price for parathread in relay chain currency

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819

    #[pallet::storage]

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    pub type MaxCorePrice<T: Config> = StorageMap<_, Blake2_128Concat, ParaId, u128, OptionQuery>;

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    /// Max tip for collator assignment on congestion

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20753

    #[pallet::storage]

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    pub type MaxTip<T: Config> = StorageMap<_, Blake2_128Concat, ParaId, BalanceOf<T>, OptionQuery>;

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    #[pallet::call]

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    impl<T: Config> Pallet<T>

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    where

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        BlockNumberFor<T>: Into<BalanceOf<T>>,

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        #[pallet::call_index(0)]

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        #[pallet::weight(T::WeightInfo::purchase_credits())]

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        #[allow(clippy::useless_conversion)]

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        pub fn purchase_credits(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            credit: BalanceOf<T>,

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        ) -> DispatchResultWithPostInfo {

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            let account = ensure_signed(origin)?;

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            let parachain_tank = Self::parachain_tank(para_id);

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            T::Currency::transfer(

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                &account,

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                &parachain_tank,

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                credit,

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                ExistenceRequirement::KeepAlive,

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)?;

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            Self::deposit_event(Event::<T>::CreditsPurchased {

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                para_id,

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                payer: account,

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                credit,

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});

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            Ok(().into())

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        /// Set the number of block production credits for this para_id without paying for them.

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        /// Can only be called by root.

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        #[pallet::call_index(1)]

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        #[pallet::weight(T::WeightInfo::set_block_production_credits())]

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        #[allow(clippy::useless_conversion)]

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        pub fn set_block_production_credits(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            free_block_credits: BlockNumberFor<T>,

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        ) -> DispatchResultWithPostInfo {

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            ensure_root(origin)?;

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            Self::set_free_block_production_credits(&para_id, free_block_credits);

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            Ok(().into())

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        /// Helper to set and cleanup the `GivenFreeCredits` storage.

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        /// Can only be called by root.

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        #[pallet::call_index(2)]

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        #[pallet::weight(T::WeightInfo::set_given_free_credits())]

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        #[allow(clippy::useless_conversion)]

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        pub fn set_given_free_credits(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            given_free_credits: bool,

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        ) -> DispatchResultWithPostInfo {

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            ensure_root(origin)?;

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            if given_free_credits {

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                GivenFreeCredits::<T>::insert(para_id, ());

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            } else {

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                GivenFreeCredits::<T>::remove(para_id);

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            Ok(().into())

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        /// Call index to set the refund address for non-spent tokens

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        #[pallet::call_index(3)]

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        #[pallet::weight(T::WeightInfo::set_refund_address())]

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        #[allow(clippy::useless_conversion)]

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        pub fn set_refund_address(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            refund_address: Option<T::AccountId>,

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        ) -> DispatchResultWithPostInfo {

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            T::ManagerOrigin::ensure_origin(origin, &para_id)?;

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            RefundAddress::<T>::set(para_id, refund_address.clone());

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            Self::deposit_event(Event::<T>::RefundAddressUpdated {

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                para_id,

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                refund_address,

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});

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            Ok(().into())

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        /// Set the number of block production credits for this para_id without paying for them.

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        /// Can only be called by root.

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        #[pallet::call_index(4)]

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        #[pallet::weight(T::WeightInfo::set_block_production_credits())]

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        #[allow(clippy::useless_conversion)]

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        pub fn set_collator_assignment_credits(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            free_collator_assignment_credits: u32,

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        ) -> DispatchResultWithPostInfo {

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            ensure_root(origin)?;

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            Self::set_free_collator_assignment_credits(&para_id, free_collator_assignment_credits);

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            Ok(().into())

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        /// Max core price for parathread in relay chain currency

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        #[pallet::call_index(5)]

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        #[pallet::weight(T::WeightInfo::set_max_core_price())]

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        #[allow(clippy::useless_conversion)]

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        pub fn set_max_core_price(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            max_core_price: u128,

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        ) -> DispatchResultWithPostInfo {

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            T::ManagerOrigin::ensure_origin(origin, &para_id)?;

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            MaxCorePrice::<T>::insert(para_id, max_core_price);

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2

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            Self::deposit_event(Event::<T>::MaxCorePriceUpdated {

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                para_id,

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                max_core_price,

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2

});

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2

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2

            Ok(().into())

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        /// Set the maximum tip a container chain is willing to pay to be assigned a collator on congestion.

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        /// Can only be called by container chain manager.

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        #[pallet::call_index(6)]

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        #[pallet::weight(T::WeightInfo::set_max_tip())]

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        #[allow(clippy::useless_conversion)]

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        pub fn set_max_tip(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            max_tip: Option<BalanceOf<T>>,

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        ) -> DispatchResultWithPostInfo {

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            T::ManagerOrigin::ensure_origin(origin, &para_id)?;

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            MaxTip::<T>::set(para_id, max_tip);

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            Ok(().into())

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    impl<T: Config> Pallet<T> {

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        /// Burn a credit for the given para. Deducts one credit if possible, errors otherwise.

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22804

        pub fn burn_block_production_free_credit_for_para(

314

22804

            para_id: &ParaId,

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22804

        ) -> DispatchResultWithPostInfo {

316

22804

            let existing_credits =

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22804

                BlockProductionCredits::<T>::get(para_id).unwrap_or(BlockNumberFor::<T>::zero());

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22804

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22804

            ensure!(

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22804

                existing_credits >= 1u32.into(),

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403

                Error::<T>::InsufficientCredits,

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);

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22401

            let updated_credits = existing_credits.saturating_sub(1u32.into());

325

22401

            BlockProductionCredits::<T>::insert(para_id, updated_credits);

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22401

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22401

            Self::deposit_event(Event::<T>::BlockProductionCreditBurned {

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22401

                para_id: *para_id,

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22401

                credits_remaining: updated_credits,

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22401

});

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22401

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22401

            Ok(().into())

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22804

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        /// Burn a credit for the given para. Deducts one credit if possible, errors otherwise.

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9501

        pub fn burn_collator_assignment_free_credit_for_para(

337

9501

            para_id: &ParaId,

338

9501

        ) -> DispatchResultWithPostInfo {

339

9501

            let existing_credits = CollatorAssignmentCredits::<T>::get(para_id).unwrap_or(0u32);

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9501

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9501

            ensure!(existing_credits >= 1u32, Error::<T>::InsufficientCredits,);

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            let updated_credits = existing_credits.saturating_sub(1u32);

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9231

            CollatorAssignmentCredits::<T>::insert(para_id, updated_credits);

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9231

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9231

            Self::deposit_event(Event::<T>::CollatorAssignmentCreditBurned {

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9231

                para_id: *para_id,

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9231

                credits_remaining: updated_credits,

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9231

});

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9231

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9231

            Ok(().into())

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9501

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354

219

        pub fn give_free_credits(para_id: &ParaId) -> Weight {

355

219

            if GivenFreeCredits::<T>::contains_key(para_id) {

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                // This para id has already received free credits

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2

                return Weight::default();

358

217

359

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217

            // Set number of credits to FreeBlockProductionCredits

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            let block_production_existing_credits =

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                BlockProductionCredits::<T>::get(para_id).unwrap_or(BlockNumberFor::<T>::zero());

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217

            let block_production_updated_credits = T::FreeBlockProductionCredits::get();

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217

            // Do not update credits if for some reason this para id had more

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217

            if block_production_existing_credits < block_production_updated_credits {

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217

                Self::set_free_block_production_credits(para_id, block_production_updated_credits);

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217

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            // Set number of credits to FreeCollatorAssignmentCredits

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            let collator_assignment_existing_credits =

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                CollatorAssignmentCredits::<T>::get(para_id).unwrap_or(0u32);

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            let collator_assignment_updated_credits = T::FreeCollatorAssignmentCredits::get();

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217

374

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            // Do not update credits if for some reason this para id had more

375

217

            if collator_assignment_existing_credits < collator_assignment_updated_credits {

376

217

                Self::set_free_collator_assignment_credits(

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217

                    para_id,

378

217

                    collator_assignment_updated_credits,

379

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);

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217

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            // We only allow to call this function once per para id, even if it didn't actually

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            // receive all the free credits

384

217

            GivenFreeCredits::<T>::insert(para_id, ());

385

217

386

217

            Weight::default()

387

219

388

389

285

        pub fn set_free_collator_assignment_credits(

390

285

            para_id: &ParaId,

391

285

            free_collator_assignment_credits: u32,

392

285

) {

393

285

            if free_collator_assignment_credits.is_zero() {

394

46

                CollatorAssignmentCredits::<T>::remove(para_id);

395

239

            } else {

396

239

                CollatorAssignmentCredits::<T>::insert(para_id, free_collator_assignment_credits);

397

239

398

399

285

            Self::deposit_event(Event::<T>::CollatorAssignmentCreditsSet {

400

285

                para_id: *para_id,

401

285

                credits: free_collator_assignment_credits,

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285

});

403

285

404

405

317

        pub fn set_free_block_production_credits(

406

317

            para_id: &ParaId,

407

317

            free_collator_block_production_credits: BlockNumberFor<T>,

408

317

) {

409

317

            if free_collator_block_production_credits.is_zero() {

410

75

                BlockProductionCredits::<T>::remove(para_id);

411

242

            } else {

412

242

                BlockProductionCredits::<T>::insert(

413

242

                    para_id,

414

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                    free_collator_block_production_credits,

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242

);

416

242

417

418

317

            Self::deposit_event(Event::<T>::BlockProductionCreditsSet {

419

317

                para_id: *para_id,

420

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                credits: free_collator_block_production_credits,

421

317

});

422

317

423

424

6147

        pub fn charge_tip(para_id: &ParaId, tip: &BalanceOf<T>) -> Result<(), DispatchError> {

425

6147

            // Only charge the tip to the paras that had a max tip set

426

6147

            // (aka were willing to tip for being assigned a collator)

427

6147

            if MaxTip::<T>::get(para_id).is_some() {

428

184

                let tip_imbalance = T::Currency::withdraw(

429

184

                    &Self::parachain_tank(*para_id),

430

184

                    *tip,

431

184

                    WithdrawReasons::TIP,

432

184

                    ExistenceRequirement::KeepAlive,

433

184

)?;

434

435

168

                Self::deposit_event(Event::<T>::CollatorAssignmentTipCollected {

436

168

                    para_id: *para_id,

437

168

                    payer: Self::parachain_tank(*para_id),

438

168

                    tip: *tip,

439

168

});

440

168

                T::OnChargeForCollatorAssignmentTip::on_unbalanced(tip_imbalance);

441

5963

442

6131

            Ok(())

443

6147

444

445

        pub fn free_block_production_credits(para_id: ParaId) -> Option<BlockNumberFor<T>> {

446

            BlockProductionCredits::<T>::get(para_id)

447

448

449

        pub fn free_collator_assignment_credits(para_id: ParaId) -> Option<u32> {

450

            CollatorAssignmentCredits::<T>::get(para_id)

451

452

453

        pub fn given_free_credits(para_id: ParaId) -> Option<()> {

454

            GivenFreeCredits::<T>::get(para_id)

455

456

457

        pub fn refund_address(para_id: ParaId) -> Option<T::AccountId> {

458

            RefundAddress::<T>::get(para_id)

459

460

461

        pub fn max_tip(para_id: ParaId) -> Option<BalanceOf<T>> {

462

            MaxTip::<T>::get(para_id)

463

464

465

466

    #[pallet::genesis_config]

467

    pub struct GenesisConfig<T: Config> {

468

        pub para_id_credits: Vec<FreeCreditGenesisParams<BlockNumberFor<T>>>,

469

470

471

    impl<T: Config> Default for GenesisConfig<T> {

472

133

        fn default() -> Self {

473

133

            Self {

474

133

                para_id_credits: Default::default(),

475

133

476

133

477

478

479

537

    #[pallet::genesis_build]

480

    impl<T: Config> BuildGenesisConfig for GenesisConfig<T> {

481

1318

        fn build(&self) {

482

1786

            for para_id_credits in &self.para_id_credits {

483

468

                BlockProductionCredits::<T>::insert(

484

468

                    para_id_credits.para_id,

485

468

                    para_id_credits.block_production_credits,

486

468

);

487

468

                CollatorAssignmentCredits::<T>::insert(

488

468

                    para_id_credits.para_id,

489

468

                    para_id_credits.collator_assignment_credits,

490

468

);

491

468

492

1318

493

494

495

496

// Params to be set in genesis

497

#[derive(PartialEq, Eq, Clone, Encode, Decode, RuntimeDebug, TypeInfo, Serialize, Deserialize)]

498

pub struct FreeCreditGenesisParams<BlockProductCredits> {

499

    pub para_id: ParaId,

500

    pub block_production_credits: BlockProductCredits,

501

    pub collator_assignment_credits: u32,

502

503

impl<BlockProductCredits> From<(ParaId, BlockProductCredits, u32)>

504

    for FreeCreditGenesisParams<BlockProductCredits>

505

506

696

    fn from(value: (ParaId, BlockProductCredits, u32)) -> Self {

507

696

        Self {

508

696

            para_id: value.0,

509

696

            block_production_credits: value.1,

510

696

            collator_assignment_credits: value.2,

511

696

512

696

513

514

515

/// Balance used by this pallet

516

pub type BalanceOf<T> =

517

    <<T as Config>::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance;

518

519

pub type CurrencyOf<T> = <T as Config>::Currency;

520

/// Type alias to conveniently refer to the `Currency::NegativeImbalance` associated type.

521

pub type NegativeImbalanceOf<T> =

522

    <CurrencyOf<T> as Currency<<T as frame_system::Config>::AccountId>>::NegativeImbalance;

523

/// Handler for fee charging. This will be invoked when fees need to be deducted from the fee

524

/// account for a given paraId.

525

/// Returns the cost for a given block credit at the current time. This can be a complex operation,

526

/// so it also returns the weight it consumes. (TODO: or just rely on benchmarking)

527

pub trait ProvideBlockProductionCost<T: Config> {

528

    fn block_cost(para_id: &ParaId) -> (BalanceOf<T>, Weight);

529

530

531

/// Returns the cost for a given block credit at the current time. This can be a complex operation,

532

/// so it also returns the weight it consumes. (TODO: or just rely on benchmarking)

533

pub trait ProvideCollatorAssignmentCost<T: Config> {

534

    fn collator_assignment_cost(para_id: &ParaId) -> (BalanceOf<T>, Weight);

535

536

537

impl<T: Config> AuthorNotingHook<T::AccountId> for Pallet<T> {

538

    // This hook is called when pallet_author_noting sees that the block number of a container chain has increased.

539

    // Currently we always charge 1 credit, even if a container chain produced more that 1 block in between tanssi

540

    // blocks.

541

22677

    fn on_container_authors_noted(infos: &[AuthorNotingInfo<T::AccountId>]) -> Weight {

542

45477

        for info in infos {

543

22800

            let para_id = info.para_id;

544

22800

            if Pallet::<T>::burn_block_production_free_credit_for_para(&para_id).is_err() {

545

400

                let (amount_to_charge, _weight) =

546

400

                    T::ProvideBlockProductionCost::block_cost(&para_id);

547

400

548

400

                match T::Currency::withdraw(

549

400

                    &Self::parachain_tank(para_id),

550

400

                    amount_to_charge,

551

400

                    WithdrawReasons::FEE,

552

400

                    ExistenceRequirement::KeepAlive,

553

400

) {

554

320

                    Err(e) => log::warn!(

555

318

                        "Failed to withdraw block production payment for container chain {}: {:?}",

556

318

                        u32::from(para_id),

557

558

),

559

80

                    Ok(imbalance) => {

560

80

                        T::OnChargeForBlock::on_unbalanced(imbalance);

561

80

562

563

22400

564

565

566

22677

        T::WeightInfo::on_container_authors_noted(infos.len() as u32)

567

22677

568

569

    #[cfg(feature = "runtime-benchmarks")]

570

    fn prepare_worst_case_for_bench(

571

        _author: &T::AccountId,

572

        _block_number: BlockNumber,

573

        para_id: ParaId,

574

) {

575

        let (amount_to_charge, _weight) = T::ProvideBlockProductionCost::block_cost(&para_id);

576

        // mint large amount (bigger than ED) to ensure withdraw will not fail.

577

        let mint = BalanceOf::<T>::from(2_000_000_000u32).saturating_add(amount_to_charge);

578

579

        // mint twice more to not have ED issues

580

        T::Currency::resolve_creating(&Self::parachain_tank(para_id), T::Currency::issue(mint));

581

582

583

584

impl<T: Config> CollatorAssignmentHook<BalanceOf<T>> for Pallet<T> {

585

    // is_parathread parameter for future use to apply different logic

586

3

    fn on_collators_assigned(

587

3

        para_id: ParaId,

588

3

        maybe_tip: Option<&BalanceOf<T>>,

589

3

        _is_parathread: bool,

590

3

    ) -> Result<Weight, DispatchError> {

591

        // Withdraw assignment fee

592

2

        let maybe_assignment_imbalance =

593

3

            if Pallet::<T>::burn_collator_assignment_free_credit_for_para(&para_id).is_err() {

594

3

                let (amount_to_charge, _weight) =

595

3

                    T::ProvideCollatorAssignmentCost::collator_assignment_cost(&para_id);

596

3

                Some(T::Currency::withdraw(

597

3

                    &Self::parachain_tank(para_id),

598

3

                    amount_to_charge,

599

3

                    WithdrawReasons::FEE,

600

3

                    ExistenceRequirement::KeepAlive,

601

3

)?)

602

            } else {

603

                None

604

};

605

606

2

        if let Some(&tip) = maybe_tip {

607

            // Only charge the tip to the paras that had a max tip set

608

            // (aka were willing to tip for being assigned a collator)

609

2

            if MaxTip::<T>::get(para_id).is_some() {

610

2

                match T::Currency::withdraw(

611

2

                    &Self::parachain_tank(para_id),

612

2

                    tip,

613

2

                    WithdrawReasons::TIP,

614

2

                    ExistenceRequirement::KeepAlive,

615

2

) {

616

1

                    Err(e) => {

617

                        // Return assignment imbalance to tank on error

618

1

                        if let Some(assignment_imbalance) = maybe_assignment_imbalance {

619

1

                            T::Currency::resolve_creating(

620

1

                                &Self::parachain_tank(para_id),

621

1

                                assignment_imbalance,

622

1

);

623

1

624

1

                        return Err(e);

625

626

1

                    Ok(tip_imbalance) => {

627

1

                        Self::deposit_event(Event::<T>::CollatorAssignmentTipCollected {

628

1

                            para_id,

629

1

                            payer: Self::parachain_tank(para_id),

630

1

                            tip,

631

1

});

632

1

                        T::OnChargeForCollatorAssignmentTip::on_unbalanced(tip_imbalance);

633

1

634

635

636

637

638

1

        if let Some(assignment_imbalance) = maybe_assignment_imbalance {

639

1

            T::OnChargeForCollatorAssignment::on_unbalanced(assignment_imbalance);

640

1

641

642

1

        Ok(T::WeightInfo::on_collators_assigned())

643

3

644

645

646

impl<T: Config> CollatorAssignmentTip<BalanceOf<T>> for Pallet<T> {

647

7602

    fn get_para_tip(para_id: ParaId) -> Option<BalanceOf<T>> {

648

7602

        MaxTip::<T>::get(para_id)

649

7602

650

651

652

impl<T: Config> Pallet<T> {

653

    /// Derive a derivative account ID from the paraId.

654

10653

    pub fn parachain_tank(para_id: ParaId) -> T::AccountId {

655

10653

        let entropy = (b"modlpy/serpayment", para_id).using_encoded(blake2_256);

656

10653

        Decode::decode(&mut TrailingZeroInput::new(entropy.as_ref()))

657

10653

            .expect("infinite length input; no invalid inputs for type; qed")

658

10653

659

660

    /// Hook to perform things on deregister

661

97

    pub fn para_deregistered(para_id: ParaId) {

662

97

        // Drain the para-id account from tokens

663

97

        let parachain_tank_balance = T::Currency::total_balance(&Self::parachain_tank(para_id));

664

97

        if !parachain_tank_balance.is_zero() {

665

14

            if let Ok(imbalance) = T::Currency::withdraw(

666

14

                &Self::parachain_tank(para_id),

667

14

                parachain_tank_balance,

668

14

                WithdrawReasons::FEE,

669

14

                ExistenceRequirement::AllowDeath,

670

14

) {

671

14

                if let Some(address) = RefundAddress::<T>::get(para_id) {

672

7

                    T::Currency::resolve_creating(&address, imbalance);

673

7

                } else {

674

7

                    // Burn for now, we might be able to pass something to do with this

675

7

                    drop(imbalance);

676

7

677

678

83

679

680

        // Clean refund addres

681

97

        RefundAddress::<T>::remove(para_id);

682

97

683

97

        // Clean credits

684

97

        BlockProductionCredits::<T>::remove(para_id);

685

97

        CollatorAssignmentCredits::<T>::remove(para_id);

686

97

        MaxTip::<T>::remove(para_id);

687

97

        MaxCorePrice::<T>::remove(para_id);

688

97

689